<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html
        PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
        "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
    <title>Title</title>
</head>
<body>
        <!-- 加大加粗 -->
        <h1>Ivor</h1>
        <h2>Ivor</h2>
        <h3>Ivor</h3>
        <h4>Ivor</h4>
        <h5>Ivor</h5>
        <h6>Ivor</h6>
</body>
</html>